don't stop at cannot definition when checking class - closes #131

lib/cancan/can_definition.rb

@@ -30,7 +30,7 @@ module CanCan
       elsif @conditions.kind_of?(Hash) && subject.class != Class
         matches_conditions_hash?(subject)
       else
-        true
+        @base_behavior
       end
     end
 

spec/cancan/ability_spec.rb

@@ -246,6 +246,14 @@ describe CanCan::Ability do
     @ability.can?(:read, [[4, 5, 6]]).should be_false
   end
 
+  it "should not stop at cannot definition when comparing class" do
+    @ability.can :read, Array
+    @ability.cannot :read, Array, :first => 1
+    @ability.can?(:read, [2,3,5]).should be_true
+    @ability.can?(:read, [1,3,5]).should be_false
+    @ability.can?(:read, Array).should be_true
+  end
+
   it "should has eated cheezburger" do
     lambda {
       @ability.can? :has, :cheezburger